component list

Hello all, I am very new to RC and hope to gain some insight from you more experienced flyers. A buddy and myself are going in on this project together, and after doing our homework we've come up with this list from hobby-king...

Sorry if I didn't get this in the correct forum section, I asked so many different questions I couldn't decide where it belonged.
TL;DR:
1) My end goal is to scratch build FPV platforms, need help picking components that will be up to that task.
2) My current budget (around $300 US) has to...